“The thing that really limits human lifespan is cell death,” Rick Gerhardt, Biologist and Christian Apologist. From a scientific perspective, programmed cell death keep humans from lasting any more than around 120 years at the most. Theories include the possibility that God made this change after the Flood, or – for a more scientific theory – a nearby supernova could have created harmful radiation that produced the same effect. “There probably comes a point where too much natural explanation would take away from the point of the whole story.”